Spot on Restio the Acacia burkei commonly known as the Black Monkey-thorn is easily mistaken with the African Weeping Wattle.
Did you know that Weaping Wattle leaves can used as toilet paper if you are ever in the bush and do not have any (not that I have ever tried it).
However it would be wise to first know the difference between them and the Black Monkey-thorn because using the wrong one could have very painful results!!!

In university botany and during field guide training I was taught that it is the common hook thorn that can very easily be confused with the african wattle. This is because the common hook thorn has very small recurved thorns that are sometimes absent on some branches and the wattle has no thorns and very similar leaves.

The monkey thorn has quite well developed recurved thorns so it would be less easily confused with the wattle but it is possible nevertheless.